Tractor



Oct. 19, 1937. BROWN 7 Re. 20,532

' TRACTOR Original Filed Juna 17, 1935 6 sheets -sheet 1 I INVENTOR. M I M! WITNESS.

AM Mao-.0. v

A TTORNEY5.

21M, ad mwwq Oct. 19, 1937.

T. BROWN I 6 Sheets-Sheet 2- GO o O x 0Q a \v w m m w v N I s e a a a M v ow 5 mm mm n S I g r 0 mm m MN L a m m INVV TOR. M M

m m m T A WITNESS. I AM T. BROWN Oct. 19, 1937. I

TRACTOR Original Filed June 1'7, 1935 6 Sheets-Sheet 3 III/I/l/I/l/III/111111111011nllllllliiiI/l/Il/l I ll INVENTOR,

BY 7 AM M,M M, ATTORNEYS.

WIT/V6.55.

1: BROWN qmcwo a Original Filed June 17, 1935 6 Sheets-Sheet 4 INVENTQR.

ATTORNEYS.

WITNESS:

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T. BROWN TRACTOR Original Filed June 17, 1935 6' Sheets-Sheet 5 ATTORNEYS.

WITNESS. 5M

T. BROWN Oct. 19, 1937.

TRACTOR Original Filed June 17,. 1935 6 Sheets-Sheet 6 [N VENTOR Gi QM 4 'TTOR NE ys.

, 35E1ing of whichihe implements are raised or low- Reis'sued Oct. 19,1937

PATENT OFFlCE I macros Theophilus Brown, mnm m, assignor to John Deere Tractor Company,

corporation of Iowa Original No. 2,057,935,

Serial No. 27,960, June 17, 1935.

Waterloo. Iowa, a

dated October 20, 1938, Application for reissue December 7, 1936, Serial No. 114,873

p 46 Claims. I This application is a continuation in part of my copending application .Serial No. 653,067, filed January 23, 1933.

' 'Ihis' invention has to do with tractorsoi' thetype commonly used to propelagricultural implements of various sorts,'such as plows, cultivators, planters; harvesters, etc, In some instances the implement is arranged to be attached at the forward portion of the tractor, and in others at the rear portion thereof, but so far as my present invention is concerned it may be-employed with either arrangement,

Where the implement associated with the tractor has operating parts that are required to be ers, and the like or where it has parts that must be-raised or lowered-as in the case of plows, cultivators and like impiements,-it has heretofore been proposed to employ power derived from the tractorgenerally from the motor by which the tractor is itself drivento eflect the desired operationof such implement parts.

To this end it is common practice to equip the tractor with a power take-oil. shaft mounted in a suitable housing adapted to be applied to the tractor body or frame, either at the side or at the rear thereof, according to the preference of v, the designer.

Heretofore, in equipping tractors with means v '30 for utilizing the power of the tractor motor to raise or lowerthe operating parts of the implement, it has been the practice to provide an actuating rock shaft mounted upon. the tractor frame, or otherwise supported by it, by the rock ered'througlr provision has been made for rocking such rock shaft at the option of the operator through intermittently operable clutch mechanism mounted on the tractor and arranged to be driven from the tractor motor. A construction of this kind in which an actuating rock shaft, mounted on;- the rear portion of the tractor frame, is rocked by the operation of half revolution clutch mechanism attached at the rear of such frame and driven from the tractor motor through a rearwardly extending power take-oil shaft, is shown in Letters Patent No. 1,872,237, granted to me August 16, 1932. In such construction, however,

- the rockshaft is mounted on the tractor frame separately from the power lift operating devices, and consequently separate provision must be made for so supporting it.

My present invention has for its primary ob- Ject the provisionv of 3 power lii't mechanism driven-as in harvesters of various kinds, mowsuitable operating connections, and

' rigs connected with a draft member at the foradapted to be applied as a unit to a farm tractor for raising or lowering the implements operatedthereby by power from the tractor motor, whether they be located at the front or at the rear of the tractor, such unit being complete in 6 I itself so far as the operating powordift elements, including the actuating rock shaftf'or its-equivalent, are concerned, so'that it mayr adilybe applied to a tractor, whether'at the side. or at the rearthereof, by simply attaching it to the tractor frame or body over the opening usually provided for giving access to the interior of the gear, case or the differential housing, in accordance with the practice above mentioned. For many 'years it has been customary to provide either the gear case orthe rear axle housing of tractors with such an opening, which is generally closed by a removablecover plate, and my improvedattachment may convenientlyibe applied int similar manner. So far as I am aware, no one 30 has heretofore proposed to include the rock shaft referred to as a part of a unitary-power lift attachment that includes also the power lift ac- Q tuating devices, and is arranged to be unitarily applied to or remoiged from the side portion or the rear portion of a farm tractor, and this is a 'salient characteristic of my, present invention. This unitary arrangement is advantageous not only because it greatly facilitatesthe application of the power lift mechanism to, or its removal from the tractor, but also because it insures that the operating parts of such mechanism, including the rock shaft and the connections for actuating it properly, will not become disarranged by the removal or replacement of the attachment. Inthe accompanying drawings I have illustrated three ways in which my invention may be embodied, one of the forms shown being adapted for application to the aide portion of the tractor frame or body, and the other two for application at the rear thereof. In any case the power lift mechanism, including the rock shaft, may readily be applied to or removed from the tractor without disturbing its operating mechanism or the implements connected therewith.

In the accompanying drawings, Figure 1 is a plan view of a well-known commercial farm tractor, equipped with cultivator ward portion thereof, having my improved power lift attachment applied thereto-at the side of the tractor frame adjacent to the rear end thereof;

Iil' 'igure 2 is a side elevation of the parts shown Figure 1, one-rear wheel being removed and the power take-off shaft extends through an opening at the rear of the tractor frame or gear case, in this case the attachment being applied at the rear instead of at the side of the tractor frame;

Figure 6 is an enlarged detail, being a partial rear elevation of the arrangement shown in Fig-- ure 5;

Figure 7 is a longitudinal line l-| of Figure 6; V

Figure 8 is a section taken along the line 2-4 of Figure 9 and illustrates a third form of construction embodying the principles of the present invention;

vertical section on Figure 9 is a central section taken along theline l! of Figure 8; and

Figure 10 is a horizontal section taken along the line llllll of Figure 9. v

I have chosen to illustrate my invention as applied to a tractor in which the crank case and housing for the change speed gearing and the differential gearing constitute the body or frame of the tractor, but it is to be understood that my invention may be applied to tractors in which there is a. separate frame which supports the operating parts and the housings therefor, since the particular construction of the tractor forms no part of my invention, aside from the fact that provision must be made for taking off power :from the driving mechanism of the tractor, preferably at a point that will permit the power take-off shaft, or its equivalent, to be driven independently of the driving of the propelling ground wheels of the tractor, as is well known in the art.

Referring now to Figures 1 to 4, the reference numeral ill indicates the tractor as a whole,

- which is provided, with rear drive wheels ll, I2

and one or more front steering wheels ii. The tractor illustrated is of the so-called tricycle type in which there are usually two front steering wheels set close together to operate as one, but obviously there could be two widely spaced front steering wheels, as is common practice. The rear wheels I I, II are mounted on stub axles l4, I! carried by housing ll, Il, at the ends of transversely extending Jack-shafts l8 enclosed in tubular housings or quills I8, 20 that extend from pposite sides of the central portion 2| of the tractor body. The Jack-shafts I! are con nected with the tractor motor through suitable differential gearing contained within the tractor body 2|, and they operate to drive the wheels I I,

I2 through chain and. sprocket gearing con tained within the housings IS, IT. The purpose of this well-known arrangement is to provide.

what is, in effect, an arched rear axle, to adapt the tractor for use in cultivating operations, but it is to be understood that my invention may be applied to a tractor in which the rear wheels are mounted on a straight rear axle, rather than on an arched one, in which case the design of the rear axle housing would be appropriately altered.

The tractor is equipped with the usual control devices, such as a steering wheel 22 for steering the front wheels I! and a gear shift lever 22 operatingv in the usual H-type bracket 24 for shifting gears. These parts are of conventional design and need not be described. I 1

As has been said, .the tractor illustrated is equipped with cultivator rigs 25 which are connected to a transverse draft beam 28, preferably tubular in form, that is" connected with the forward portion of the tractor and extends at opposite'sides thereof, as best shown in Figure l. The rigs are arranged to be raised or lowered by the rocking of a rock shaft 21 which is also mounted on the foward portion of the tractor and extends at opposite sides thereof parallel with the draft beam 26. This rock shaftmay either by a continuous one that extends at both sides of the tractor, or it may be made in separate parts, one mounted at each side of the tractor. In Figure 2 the connections by which the rocking of the rock shaft 21 to raise or lower the rigs are shown, but as such connections may be varied at the option of the manufacturer and their particular construction constitutes no part of my present-invention, they need not be described.

tor, such connections comprising an arm 28 fixedly connected therewith and, in this instance, extending upwardly therefrom, and a connecting rod 29 that extends rearwardly from the arm 28 at one side of the tractor. Where the rock shafts 21 are made separate, each of the members thereof is provided with an arm 28 and a connecting rod 29, as shown in Figure 1. If desired, even where-the rock shaft 21 is continuous, the two arms 28 and connecting rods 29 may be employed, so that power may be applied equally to both end portions of said rock shaft.

The rear end portions of the connecting rods 20, where two are provided, are connected to arms 3|) secured to the opposite end portions of power lift means in the form of an actuating rock shaft 3| that is part of the power lift mechanism considered as a whole. As shown in Figure 3, this actuating rock shaft or power lift means is mounted in suitable bearings in the side members 1 side of the tractor body may be omitted, for which purpose a coupling 36 outside the housing 34 is provided. The portion 3 la, when used,-is preferably journaled in a bearing ill: on the tractor body. Obviously said rock shaft may also be connected to raise or lower implements at the rear of the tractor, if desired.

Within the housing 34 the actuating rock shaft 3! is provided with an arm 31 fixedly secured thereto, to which arm is connected a pitman 38 by the reciprocation of which the rock shaft 3! may be rocked. I

In the construction illustrated, the pitman 38 is adapted to be actuated by power derived from the tractor motor through a suitably driven power take-off shaft and optionally operated half revolution self-interrupting. clutch mechanism of the type commonly used for powerv lift purposes on agricultural implements of various sorts, but it is to be understood that my present invention is not shaft, as any other suitable power lift actuating mechanism or means for transmitting power from the power take-oil shaft to the actuating rock shaft may be employed, provided it be such that it, together with the actuating rock shaft, may be applied to' or removed from the tractor as a unit. I

' The arrangement of the power take-off shaft, and the construction of the half revolution clutch mechanism illustrated in Figures 3 and 4 is in all essential respects like that shown and described in the Letters Patent issued to myself and L. A. Murray, No. 1,933,539, dated November 7, 1933. and the manner in which the attachment is applied to the tractor body is also substantially the same, so that it is believed to be unnecessary to describe such parts here in detail. It will sufllce to say that the clutch mechanism shown comprises a worm wheel 39 that is constantly driven by a worm 40 on a power take-off shaft 4| mounted in suitable anti-friction bearings in a housing member 42 that is adapted to be connected to the lower portion of the housing 34, these parts being connected by bolts 43. The shaft 4| extends longitudinally of the tractor and preferably its ends project out of the housing member 42 forwardly and rearwardly so that connectionmay be made to either or both ends for taking off power therefrom to operate implements connected with the front or rear portions of the tractor. The shaft 4| is provided with a bevel pinion 44 which meshes with a bevel pinion 45 carried by a transverse shaft 46 mounted in suitable anti-friction bearings carried by a sleeve 41 that is fitted in a tubular extension 43 in the housing member 42. This extension member 48 is adapted to fit into the usual opening 43 provided at the side of the body of cert'ain-well-known tractors near the rear portion thereof, for giving access to the interior of the gear case. Bolts 60 secure the housing member 42 in position, and also serve tov further secure the housing 34 in place. The shaft 46 is arranged to be driven unidirectionally in any suitable way from the power plant of the tractor, as for example by the connections shown and described in said Brown and Murray patent, or by connections to the transmission mechanism as described in the Sundboom Patent No. 1,514,876, dated November 11, 1924. However, any other suitable connections such as are commonly employed for driving a power takeoff shaft may be employed.

The pitman 38 is actuated to rock the actuating rock shaft 3| by means of a crank that is provided with a hub 52 journaled on a stub axle 53 which is anchored in a boss 54 that is carried by the housing 34, as best shown'in Figure 3. The

' worm wheel 39 is journaled on the hub 52 so that normally it may rotate freely thereon. At one side ofsaid worm wheel is a .driven clutch member 55 that is adapted to be interlocked with said worm wheel, to cause it to rotatein unison therewith, by

the operation of suitable dogs 56 pivoted on said driven clutch member and tending to rock into operative position under the influence of a spring 51, shown in Figure 4. These dogs are normally held in retracted or inoperative position by a pawl 58 mounted on a rock shaft 33 carried by the housing 34 and pressed inwardly by a spring 60,"

also shown in said figure. The shaft 53 is rocked manually, to move the pawl 53 out of operative position, by a tripping lever 3| mounted at its lower end portion in the housing 34, as shown in Figure 3, which extends to a position-convenient to the driver's seat 62. These parts operate in the This semi-rotation of the driven clutch memberwill move the pitman 33 in one direction or the other and, consequently, will rock the actuating rock shaft 3| correspondingly to raise or lower the implement tools, as the case may be. Thus the pitman 38 constitutes an operating connection between the power lift means or rock shaft 3| and the power lift actuating mechanism which, in the illustrated construction, is the halfrevolution clutch mechanism.

From the foregoing description it will be seen that inasmuch as the half revolution clutch mechanism, the actuating rock shaft 3|, the pitman 38, and the tripping lever SI are mounted asa'unit in. the housing 34, they may be applied to or removed from the tractor body as a unit, either along with the power take-on shaft 4| and its driving connections, or separately therefrom, since by disconnectingthe bolts and 43 the housing 34 may be separately removed without disturbing quently the proper location of the actuating rock shaft 3| with respect to the length of the pitman 38, the length of the arm-31, and the position of the crank 5| when in a lifted position, to give the proper over-center relationship between the pitman and the crank, is always preserved undisturbed when the unit is removed or replaced. Preferably the housing 34 is provided with a side opening covered by a'removable cover plate B3, so that access may readily be had to the interior of said housing and the mechanism therein.

, In the arrangement shown in Figures 5 to 7 in which the power lift attachment is arranged to be applied to the usual opening 64 at the rear of the tractor body, or of its rear axle housing, a

power take-oil shaft 35 extends rearwardly' through said opening, and in the illustrated con-. struction is provided with a worm 66. This shaft may be one substituted for a shorter power takeoff shaft similarly arranged, as has been suggested in the prior art. In the arrangement shown in Figures 5 to 7 the same type of half revolution preferably slightly different in form .from the housing 34 shown in the earlier figures, due to the fact that it is attached to the rear portion of the tractor body instead of to a side portion thereof.

With this modification, instead of the power lift housing being made 'in two parts 34, 42, as shown in Figures 3 and-l, it is shown as being unitary,

' but it may be made in two parts if desired. The lower portion 12 thereof, in which is mounted the power take=ofl shaft 33, is arranged in alignment with the opening 04, so that the power take-ofl shaft 05 extendsdirectly through said opening and through the lower portion 12 of the housing 1 In the arrangement shown in Figures 5 to 7 the power take-oil! mechanism is located substantially in the center line of the tractor immediately back of the differential housing thereof, and the upper portion of the housing H is provided with' two laterally extending tubular members 12,14 that extend outward to points beyond the planes of the sides of the tractor body and support and enclose actuating rock shafts 15, 10 having at their outer ends arms 11, 18, respectively, which are thus disposed in planes outside of the planes of the sides of the tractor to receive connecting rods 29 located along the sides of the tractor. At their inner ends these rock shafts have arms 10, 00 that are located within the housing H and are connected by a pin 0| with a pitman 82 that corresponds to the pitman 30. The housing members 13, 14 are either cast integral with the housing 1| or are firmly secured thereto, and by extending them laterally as described, they provide maximum bearing support for the rock shafts 10, 10. As shown in Figure 1, the power take-off shaft 05 projects rearwardly beyond the housing 1I sothat connection may be made therewith for driving other operating parts.

The housing H is secured to the tractor frame by bolts 82, 84, by the removal of which it may readily be disconnected from the tractor, carrying' with it the power lift mechanism, including the actuating rock shafts 10, 10, the clutch mechanism, the power take-ofl shaft 65, and the tripping lever 10, which also is mounted in said housing, as shown in Figure 6. Said housing is pro-- vided with a side opening 00 through which access -to its interior for any desired purpose may be had.

- It is to be understood that the power take-off shaft 05 shown in Figure 7 may be driven from the power plant of the tractor in any suitable way,

as, for example, in the manner illustrated in prior Patents Nos. 1,640,642 or 1,872,237, granted to me, in both of which the power take-off shaft extends rearwardly through an opening in the rear axle housing and at its inner end is operatively connected with the power plant of the tractor, to be driven therefrom. 1

In the arrangement shown in Figures 1 to 4, the

' seat 02 is shown as being mounted on a support 06 that is attached to the rear of the tractor frame or rear axle housing by bolts 81, but in the arrangement shown in Figures 5 to '7, in which the power lift mechanism is attached to the rear of the'tr'actor frame, the seat 62 is preferably mounted. on a support that is secured by bolts 09 to a rearwardly extending arm preferably formed integral with the H-bracket 24 associated with the gear shifting lever 23.

In the arrangement shown in Figures 8, 9 and 10, the self-interrupting clutch means is driven from the power take-off shaft through gear reduction means and the lifting rock shaft is actuated by the power lift clutch mechanism through overload release linkage. Referring now particularly to these figures, the tractor, indicated in its entirety by the reference numeral I00, embodies a banjo type rear axle 90 having a rear flanged opening 9| of more or less conventional construction and adapted. when no power lift mechanism is associated with the tractor, to be closed by a .cover plate attached in any suitablemanner to the flanged opening 9|. In the embodiment of driving means.

my invention shown in these figures, the usual coverv plate is replaced by a power lift housing indicated in its entirety by the reference numeral includes axle shafts which, at their inner ends,- have axially spaced. main driving gears 05 and,

00 fixed thereto; Theilower portion of the housing is provided with longitudinally spaced bearing means 98 forreceiving and supporting a power.

take-off shaft 99 which may, if desired, be of sub stantially the same form as the power take-oi! shaft 55 shown in Figure 7 except that the power take-ofl shaft 99 has a separable or slip joint connection, shown in Figure 9 as a splined sleeve pinned to the forward end of the shaft 09, with a shaft that is driven by the tractor The power take-off shaft 99 is provided with a worm I00 which meshes with and serves to drive a worm wheel IOI that forms a part of a double gear element I02, best shown in Figure 10. The double gear element I02 includes a hub section I03 and a spur pinion I04, and is journaled on a fixed shaft I06 which is held in position by a set screw I01 in a pair of apertured ears I00 and 0, preferably formed and associated parts, is extended, as at 920. in

Figure 10, to provide a space for receiving the worm wheel I! and the associated half revolution clutch mechanism which is indicated in its entirety in Figures 8 and 9 by the reference numeral I20.

The half revolution clutch means I20 includes a spur gear member I2I which meshes with the pinion I04 and which is partially disposed between the drive gears and 86. By virtue of this construction and the disposition of the worm gear I0 I,

a very compact power lift unit, which does not overhang rearwardly any great amount, is provided. The gear member I2I constitutesthe constantly rotating element of the half-revolution clutch I20 and is mounted for rotation upon a transversely disposed crank shaft I24, as by suitable bushing means I25. The crank shaft I24 is provided with a reduced end I26 supported by bushing means I21 in a boss I28 formed on the extension 02a of the housing 02. '.At the other side of the extension portion 020 the housing 02 is provided with a laterally directed sleeve section which receives bushings III and I22. These bushings support the portion of the crank I24 opposite the reduced end I20, and the laterally outer end of the sleeve extension I30 is closed by suitable lubricant sealing means I35, The end of the crank shaft I24 extending laterally outwardly of the sleeve section I30 carries a crank Iflihaving a crank pin I31. I

The driven member of the clutchmechanism I20 is indicated at I40 in Figure 8, and is splined and pinned onto the crank shaft I24 adjacent the reduced end I26 thereof. The driven member I40 is adapted to be-optionaily connected with the constantly rotatable clutch member I2I through the usual dog mechanism I (Figure 9) controlled by a latch I43 mounted upon the shaft I44 joumaled for rocking movement in the casing or housing extension 02a. One end of the shaft I44 extends outwardly and carries an arm I45 (Figure 8) connected by means of a link I46 with bywhich a power lift rock shaft I54 is journaled.'

The lifting rock shaft I54 is provided with ends I55 and I55 which are polygonal and which are adapted to receive lifting connections, such as i the arms TI and I8 and the links 20 shown in Figure 6. It is to be understood, of course, that any other form of suitable lifting connections may be mounted at either, or both ends of the lifting rock shaft I54. The end I56of the lifting rock shaft also carries an arm I50 securelyfixed thereto in any manner desired laterally outwardly I of the end of the associated sleeve section I53.

The arm I60 carries acrank pin II which is operatively connected with the crank pin I31 of the crank shaft I24 through any suitable form of ,overload release mechanism I53. For example,

the overload release mechanism I53 may take the form shown in my prior Patent No. 1,997,765, issued April 16, 1935.

As will be apparent from Figure 9, the clutch mechanism I20 is of the half revolution type, that is, whenever the pedal I" is depressed the latch I43 is released and. the dog mechanism I4I connects the driven clutch member I40 with the constantly rotating driving member I2l. Since the driven clutch part I40 is fixed to the crank shaft I24, the latter will be rotated a halfrevolution, or until the dog mechanism is released, as by the return of the latch lever I 40 to its normal position. The interposition of gear reduction means between the power take-off shaft 50 and the constantly rotating gear I2I serves the very important purpose of reducing the speed ratio between the worm and worm gear, thereby not only permitting the use of a more efllcient angle on the worm gear but also reducing wear at this point. The overload release mechanism is disposed exteriorly so as to provide for convenient inspection and adjustment if necessary. Inspec tion of the overload release mechanism at intervals is desirable so that the operator will be assured that the power lift clutch and associated mechanism are adequately protected.

While I have described above the preferred embodiments, it is to be understood that my invention is not to be limited to the specific details shown and described above, but that, in fact,

widely different means may be employed in the practice of the broader aspects of my invention.

What I claim, therefore, and desire to secure by Letters Patent is: v

1. A unitary power lift attachment for tractors comprising a detachable housing adapted to be fixedly secured to the tractor-body, an actuating rock shaft mounted on and extending into said housing for application to or removal from the tractor therewith, intermediate power lift actuating mechanism mounted within said housing,

an operating connection within said housing be-.

tween said intermediate mechanism and said rock shaft, and an operating connection for driving said intermediate mechanism from the tractor driving means.

2. A unitary power lift attachment for tractors comprising a detachable housing adapted to be fixedly secured to the tractor body, an actuating rock shaft extending into and journaled in suitable bearings carried by said housing for application to or removal from the tractor therewith, intermediate power lift actuating mechanism mounted within said housing, an operating connection within said housing between said intermediate mechanism and said rock shaft, and a power take-off shaft in said housing arranged to drive said intermediate mechanism and to be driven from the tractor driving means.

3.,A unitary power lift attachment for tractors comprising a housing composed of separable housing members adapted to be fixedly secured to the tractor body, an actuating rock shaft mounted in suitable bearings in one of said members for application to or removal from the tractor therewith, intermediate power lift actuating mechanism mounted in the member of said housing that carries said rock shaft, an operating connection within said housing between said intermediate mechanism and said rock shaft, and a power take-ofi shaft mounted in the other member of said housing arranged to drive said inter mediate mechanism and to be driven from th tractor driving means.

4. The combination with a tractor including a motor for driving the same, of a unitary power lift attachment comprising a detachable housing adapted to be fixedly secured to the tractor body, an actuating rock shaft mounted on and extendfrom the tractor therewith, intermediate power housing between said intermediate mechanism and said rock shaft, and means supported by ing into said housing for application to or removal said housing for connecting said intermediate mechanism with the tractor driving means.

5. The combination with a tractor including a motor for driving the same, of a detachable housing adapted to be fixedly secured to the tractor body and comprising separable members, an actuating rock shaft mounted on and extending into one portion of said housing for application to or removal from the tractor therewith, intermediate powerlift actuating mechanism mounted in the portion of. said housing that carries said rock shaft, an operating connection within said I housing between said intermediate mechanism and said rock shaft, and a power take-off shaft mounted in the other portion of said housing and operatively connected with said intermediate mechanism, said power take-off shaft extending .into the tractor body and operatively connected with said motor.

6. A unitary power lift attachment for tractors comprising a detachable housing adapted to be fixedly secured to the tractor body, power lift actuating mechanism mounted within said housing, an operating connection in said housing for separably connecting said power lift actuating mechanism to the tractor driving means, power liftmeans in and extending out of said housing,

and an operating connection within said hous-' 'lng between said power lift means and said. power lift actuating mechanism, the latter operating connection, together with said power lift means and said power lift actuating mechanism, being supported in predetermined operative relation 6 to each other by the housing, and being unitarily applicable therewith to or removable from the '7. A tmitary .power lift attachment for tractors comprising a detachable housing adapted to be fixedly secured to the tractor body, *said housing having oppositely disposed members extendin laterally beyond the planes of the sides of the tractor body, an actuating rock shaft supported in bearings on said members and having operating connections beyond the ends of said members, said rock shaft being applicable to or removable from the tractor with said housing, as a unit, intermediate power lift actuating mechanism mounted within said housing, an operating connection within said housing'between said intermediate mechanism and said rock shaft, and an operating connection for driving said intermediate mechanism from the tractor driving means.

8. A unitary power lift attachment for tractors comprising a detachable housing adapted to be fixedly secured to the tractor body, an actuating rock shaft mounted on andextending into said housing for application to or removal from the tractor therewith, intermediate power lift actuating mechanism mounted within said housing, an operating connection within said housing between said intermediate mechanism and said rock shaft, an operating connection for driving said intermediate mechanism from the tractor driving means, and a control lever mounted on and removable with the housing.

' 9. A power lift attachment for tractors, com

prising a housing adapted to betflxedly and detachably secured to the tractor body at one side thereof, an actuating rock shaft mounted in said housing and disposed transversely of the tractor body, said rock shaft being removable from the tractor with said housing, and having a separable lateral extension supported on the opposite side of the tractor body, intermediate power lift ac.-

tuatlng mechanism mounted within said housing, an operating connection within said housing between said intermediate mechanism and said rock shaft, and an operating connection for driving said intermediate mechanism from the tractor driving means.

10. A unitary power lift attachment for tractors comprising a detachable housing adapted to be fixedly secured to the tractor body; said housing having oppositely disposed sleeve members extending laterally to a point adjacent the iongitudinal vertical planaof the sides of the tractor body, an actuating rock shaft 'iournaled in said sleeve members and having operating connections' beyond theends of said members, intermediate power lift actuating mechanism disposed within said housing, an operating connection extending intermediate mechanism and said mcssnaa. a control lever for said mechanism mounted on said housing, said rock shaft, said operating connection and said control lever being applicable to or removable from the tractor with said'housins. as a unit,

andan operating connection for driving said intermediate mechanism from the tractor driving 11. A unitary power lift attachment for tractors comprising a'detachable housing adapted to,

beflxedl ysecuredtothetractorbodisaidhoushis having oppositely disposed sleeve members extending laterally outwardly beyond the planes ofthesidesofthetractorbodmanactuating rockshaftiomnaledinsaid sleevemembers andtors comprising of said members, intermediate power lift actuating mechanismdisposed within said housing, an operating connection extending between said intermediate mechanism and said rock shaft, a control lever for said mechanism mounted on said housing, said rock shaft, said operating connection and said control lever being applicable to or removable from the tractor with said housing, as a unit, and an operating connection for driving said, intermediate mechanism from the tractor driving means.

12. A unitary power lift attachment for tractors comprising a detachable housing adapted to be fixedly secured to the tractor body, said housing having oppositely disp s d members extending laterally from the upper'portion thereof to points'adjacent the longitudinal vertical planes of the sides of the tractor body, an actuating rock shaft supported in bearings on said members and extending laterally outwardly of the ends of said members, said rock shaft cal} rying operating connections at its ends beyond the ends of said members and adjacent said planes and said rock shaft being applicable to or removable from the tractor with said housing,

as a unit, intermediate power lift actuating mechanism mounted within said housing below said laterally extending members, an operating connection carried by and removable. with; said housing and extending between said intermediate mechanism and said rock shaft, and means in the lower portion ,of said housing for driving said torscomprising a detachable housing adaptedjo be fixedly secured to the tractor body, said housing having oppositely disposed members extending laterally to points adjacentthe longitudinal vertical planes of the sides of the trac tor body, an actuating rock shaft supported in bearings on said members and having operating connections beyond the ends of said members and adjacent said planes, said rock shaft bein applicable to or removable from the tractor with said housing as a unit, intermediate power lift actuating mechanism mounted within said housing, overload release means serving to connect said intermediatemechanism and said rock shaft, a

and means for driving said intermediate mechanism from the tractor driving means.

14. A unitary power lift attachment for tracto be fixedly secured to the tractor body, said housing having oppositely disposed members extending laterally to p nts adjacent the longitudinal vertical planes of the sides of the tractor body, an actuating rock shaft supported in bearings on said members and having operating connections beyond the ends of said members,

said rock shaft being applicable to or removable from the tractor with said'housing,.as a .unit, intermediate power lift actuating mechanism mounted within said housing and including a shaft member extendingin parallelism with respect to said rock shaft and extending to 'a point outside said housing, an operating connection between the outer end of said shaft member and one end of said rock shaft for operatively connecting the latter with said intermediate mechanism, andmeans for driving said intermediate mechanism from the driving @15. A unitary power lift attachment for traca detachable housing adaptedtors comprising a detachable housing adapted to be fixedly secured to the tractor body, said housing having oppositely disposed members extending laterally from the upper portion of said housing to points adjacent the planes of the sides of the tractor, an actuating rock shaft supported insaid members and extending laterally outwardly thereof at each side. of the tractor, said rock shaft being applicable to or removable from the tractor with said housing as a unit,'intermediate power lift actuating mechanism mounted within said housing below said members and including half revolution clutch mechanism and gear reduction means for driving the same,'an

housing and including a transverse shaft adapted to be intermittently operated, a second transverse shaft, a pair of apertured parts carried upon the rear wall of said detachable housing for supporting said second transverse shaft, an operating connection between said first transverse shaft and saidrock shaft, and operating connections mounted on said second transverse shaft for driving said intermediate mechanism from the tractor driving means.

17. A unitary power lift attachment for tractors comprisinga detachable housing adapted to be fixedly secured to the tractor body, an actuating rock shaft mounted on saidhousing for application to or removal from the tractor with the housing, intermediate power lift actuating mechanism mounted within said housing and including a transverse shaft and a constantly rotatable member journaled for rotation thereon, means .on the rear wall of said housing for supporting said transverse shaft, an operating connection between said last named shaft and said rock shaft including accessible overload release mechanism disposed exteriorly of said housing, and means for drivingsaid intermediate mechanism from the tractor driving. means including a worm shaft journaled for rotation in the lower portion of said housing, and gear reduction means operatively connecting said worm shaft with said'constantly rotatable member.

.18. A unitary power lift attachment for tractors comprising a detachable housing adapted to be fixedly secured to the tractor body, an actuating rock shaft mounted on said housing for application to or removal from the tractor therewith, intermediate power lift actuating mechanism mounted within said housing below said rock shaft and including a transverse shaft journaled for rotation in said housing and a constantly rotatable member Journaled for rotation on said shaft, an operating connection between theouter end. of said transverse shaft and one end of said rock shaft, a fixed shaft carried by said housing below said transverse shaft, and means for driving said power liftactuating mechanism including'a worm shaft and gear reduction mechanism mountedon said fixed shaft and meshing with said constantly rotatable member.

19. A unitary power lift attachment for tractors comprising a detachable housing adapted to be fixedly secured to the tractor body, an actuat ing rock shaft mounted on said housing for application to or removal from the tractor therewith, intermediate power lift actuating mechanism mounted within said housing below said rock shaft and including a transverse shaft journaled for rotation'in said housing and a constantly rotatable memberjournaled for rotation on said shaft, an operating connection between the outer end of said transverse shaft and one end of said rock shaft, and means for driving said intermediate mechanism. from the tractor driving means including a longitudinally disposed worm shaft journaled for rotation in said casing, a fixed shaft carried on the rear wall of said housing, and gear reduction means including a compound gear member driven from said worm shaft and a mem: ber meshing with said constantly rotating member.

20. In a tractor having a rear axle housing provided with a rearwardly facing central opening and enclosing a pair of laterally spaced drive gears, power lift mechanism comprising a vertically arranged housing adapted to be secured to said axle housing over said rearwardly facing opening and partially embracing said drive gears,

a power lift rock shaft journaled for rocking movement in the upper portion of said power lift housing substantially above the rear portions of said drive gears, power lift mechanism disposed within said housing and including gear reduction members disposed in a position between and-parallel with respect to the planes of said spaced drive gears, and means disposed in the lower portion of said housing for driving certainof said gear reduction members.

21. In a tractor having a rear axle housing provided with a rearwardly facing central opening and enclosing a pair of laterally spaced drive gears, a vertically arranged housing adapted to be secured to said axle housing over said rearwardly facing opening and partially embracing said drive gears, a power lift shaft journaled in the upper portion of said power lift housing adjacent the rear portions of said drive gears, powerlift mechanism dlsposed within said housing operatively connected to actuate said power lift shaft and including gear reduction members disposed in a position between and parallel with respect to the planes of said spaced drive gears, and

means disposed in the lower portion of said housing for driving certain of said gear reduction members.

22. In a tractor having a rear axle housing provided with a central opening and enclosing a pair of laterally spaced drive gears, a power lift housing adapted to be secured to said axle housing over said opening and partially embracing said drive gears, a power lift shaft journaled in said power lift housing adjacent said drive gears, power lift mechanism disposed within said housing operatively connected to actuate said power lift shaft and including gear reduction members disposed in a position between and parallel with respect to the plahes of 'said drive gears, and means disposed'in said rear axle housing for driving certain of said gear reduction members.

23. A unitary power lift attachment for tractors comprising a detachable housing adapted to be fixedly secured to the tractor body, said housing having oppositely disposed members extending laterally to a point adjacent the longitudinal vertical planes of the sides of the tractor body, an actuating rock shaft supported in bearings on saidmembers and having operating connections beyond the ends of said members, intermediate power lift actuating mechanismmounted within said housing and cperatively connected within said housing to said rock shaft, said rock shaft and said intermediate power lift actuating mechanism being applicable to or removable from the tractor with said housing as a unit, and an operating connection for driving said intermediate power lift actuating mechanism from the tractor driving means.

24. A unitary power lift attachment for tractors comprising a detachable housing adapted to be fixedly secured to the tractor body, said housing having oppositely disposed members extending laterally to a point adjacent the longitudinal vertical plane of the sides of the tractor body, an

.actuating rock shaft supported in hearings on said members and having operating connections beyond the ends of said members, intermediate power lift actuating mechanism mounted within said housing and operatively connected within said housing to said rock shaft, power take-off means for driving said intermediate mechanism operatively connected to the tractor driving means, said rock shaft, said intermediate power lift actuating mechanism, and said power takeoff means being applicable to or removable from the tractor with said housing, as a unit.

, 25. A unitary power lift attachment for tractors comprising a detachable housing adapted to be fixedly secured to the tractor body, said hous-- ing having oppositely disposed sleeve members extending laterally to a point adjacent the longitudinal vertical planes of the sides of the tractor body, an actuating rock shaft journaled in said sleeve members and having operating connections beyond the ends ofsaid members, intermediate power lift actuating mechanism disposed within said housing and operatlvely connected with said rock shaft, a control lever for said mechanism mounted on said housing, said rock shaft, said intermediate power lift actuating mechanism and said control lever'bein'g applicable to or removable from the tractor with said housing, as a unit, and an operating connection for driving said intermediate mechanism from the tractor driving means.

, 26. A unitary power lift attachment for tractors comprising a supporting casting adapted to be fixedly secured to the tractor body, an actuating rock shaft supported entirely on said casting in suitable laterally extending journal bearings carried by said casting and attached to and removed from the tractor with the casting, intermediate self-interrupting power lift actuating mechanism mounted on said casting and' operatively connected to rock said rock shaft alternately in opposite directions between two terminal positions, and means for driving said actuating mechanism unidirectionally comprising an element rotatably mounted on said casting and a shaft extending from said element-to the tractor driving means and operatively connected thereto. a

27. A unitary power lift attachment for tractors comprising a detachable'housingadapted to be fixedly secured to the tractor body, an actuating rock shaft, laterally extending bearing means for both ends of the rock shaft so arranged that the latter is supported entirely on said housing for application to' or removal from the tractor 'with the housing and withoutldisturbing the relation between the rock shaftaiid said bearings, intermediate self-interrupting power lift actuat- 'operatively connected to rock said rock shaft rock said rock shaft alternately in opposite difrom the tractor driving means.

' means.

power lift n mounted within said housing mechanism mounted within said housing and alternately in opposite directions between two terminal positions, a unidirectionally rotating member in the housing and connected to actuate said intermediate power lift mechanism, and

means for driving said unidirectionallyrotating member from the tractor driving means.

28. A unitary power lift attachment for tractors comprising a detachable housing adapted to be fixedly secured to the tractor body, an actuating rock shaft extending into said housing and journaled. in suitable bearings carried by said housing for application to or removal from the tractor therewith, intermediate power lift actuating mechanism mounted within said housing and operatively connected within said housing to rections between two terminal positions, said intermediate mechanism including means for automatically interrupting the movement of said rock shaft at its terminal positions, and a power take-off shaft in said housing arranged to drive said intermediate mechanism and to be driven 29. A unitary power lift attachment for tractors comprising a housing composed of separable housing members adapted to be fixedly secured to the tractor body, an actuating rock shaft mounted in suitable bearings in one of said members for application to or removal from the tractor therewith, intermediate power lift actuating mechanism mounted in the member of said housing that carries said rock shaft and operatively connected within said housing.to rock said rock shaft alternately in opposite directions between two terminal positions, and a power take-off shaft mounted in the other member of said housing arranged to drive said intermediate mechanism and to be driven-from the tractor driving means.

30. A unitary power lift attachment for tractors comprising a detachable housing adapted-to be fixedly secured to the tractor, body, said housing having oppositely disposed members extending laterally to points adjacent to the planes of the sides of the tractor body, an actuating rock shaft supported in bearings on said members and having operating connections beyond the ends of said members, said rock shaft being applicable to or removable from the tractor with said housing as a unit, intermediate power lift actuating mechanism mounted within said housing and operatively connected within said housing to said rock shaft, and a drive shaft connected to the tractor driving means and extending into the housing and operatively connected for driving said intermediate mechanism from the tractor driving 31. A unitary power lift attachment for a tractor having a casing and engine-driven power transmission mechanism disposed within said casing, there being an aperture in a wall of said casing, said power'lift attachment comprising a housing adapted to be secured tosaid casing over said aperture, a shaft rotatably disposed within said housing and extending through said aperture, means for operatively connecting said shaft to said engine-driven mechanism for rotating said shaft unidirectionally, an actuating.

rock shaft mounted in said housing and extending laterally out of the housing to operating connections beyond the longitudinal vertical planes of the sides of the -tractor body, intermediate ing'and operatively connected within said housing to rock said rockshaft alternately in opposite directions between two terminal positions, and an operating connection for driving said intennediate power lift mechanism from said unidirectionally rotated shaft.

32. A unitary power lift attachment for a tractor having a casing and power transmission mechanism disposed within said casing, there being an aperture in a wall of said casing, said power lift attachment comprising a housing adapted to be secured to said casing over said aperture, a shaft journaled in said housing and extending through said aperture, means for connecting said shaft to said mechanism for rotating said shaft unidirectionally, said housing having oppositely disposed laterally extending members, an actuating rock shaft mounted in bearings in said members and having operating connections extending beyond the ends of said'members and beyond the longitudinal vertical planes of the sides of the tractor body, intermediate power lift mechanism mounted within said housing and operatively connected within said housing to rock saidrock shaft alternately through a predetermined degree of angular displacement between two terminal positions, and an operating connection for driving said intermediate power lift' mechanism from said unidirectionally rotated shaft, said intermediate mechanism including means for automatically interrupting the move- ;ment of said rock shaft at its terminal positions and for holding said rock shaft'in a load-sustaining position when in at least one of said terminal positions. I

33. A power lift attachment for a tractor having a casing and power transmission mechanism. disposed therein, said'power lift attachment comprising a housing adapted to be secured in abutment to said casing, 'a rotatable element disposed within said housing and adapted to be rotated unidirectionally, means for driving said element 4 from said mechanism including a shaft extending between said housing and said casing, said housing having oppositely disposed laterally extending members, an-actuating rock shaft Journaled in said members and extending laterally out of the members to operative connectionsbeyond the longitudinal vertical planes of the sides of the tractor body, intermediate power lift mechanism mounted within said housing and operatively connected within said housing to rock said rock shaft alternately in opposite directions between two terminal positions, and an operating connection for driving said intermediate power lift mechanism from said unidirectionally' rotated element, said intermediate mechanism including means for automatically interrupting the movement of said rock shaft at its terminal positions and for preventing the load from moving said rock shaft out of load-sustaining position.

34. A power.1ift attachment for a tractor having a casing and power transmission mechanism disposed therein, said power lift attachment comprising a housing adapted to be secured in abutment to a longitudinally extending side wall thereof, a transversely disposed shaft means connected to said power transmission mechanism in said casing for unidirectional rotationand ex-' tending into said housing, an actuating rock shaft Journaled in said housing and extending laterally out of the housing to operating connections beyond the longitudinal vertical planes of the sides of the tractor body, intermediate power lift mechanism mounted within said housins and operations and for preventing the load from moving said rock shaft out of load-sustaining position.

35. A power lift attachment for a tractor having a casing and power transmissionmechanism disposed therein, said casing having an aperture in the rear wall thereof, said power lift attachment comprisinga housing adapted to be secured to said casing over said aperture, a shaft-journaled in said housing and extending forwardly through said aperture into said casing, means for connecting said shaft to said mechanism for rotating said shaft unidirectionally, said shaft extending through the rear wall of said housing and having means for establishing operatingconnections between the end of said shaft and implements associated with the tractor, said housing ,having oppositely disposed laterally extending members, an actuating rock shaft mounted in bearings in said members and having operating connections extending beyond the ends'of said members and beyond the longitudinal vertical planes of the sides of the tractor body, intermediate power lift mechanism mounted within said housing and operatively connected within said housing to rock said rock shaft alternately through a predetermined degree of angular displacement between two terminal positions, and an operating connection for driving said intermediate power lift mechanism from said uni-| said aperture, a shaft rotatably disposed within said housing and extending through said aperture, means for detachably connecting said shaft to said engine-driven mechanism for rotating said shaft unidirectionally, an actuating rock shaft mounted in said housing and extending laterally out of thehousing to operating connections, intermediate power lift mechanism mounted within'said housing and operatively connected within said housing to rock said rock shaft alternately in opposite directions between two terminal positions, and means for driving said intermediate power lift mechanism. fror'n saidunidirectionally rotated shaft.

37. A unitary power lift attachment for tractors comprising a housing secured to the tractor body, an actuating rock shaft mounted in suitable bearing-in said housing and extending out of the housing to operating connections with implements associated with thetractor, a crank arm fixed to said rock shaft within said housing, intermediate ,self-interrupting power lift mechanism disposed within said housing and having an element adapted to be optionally rotated through substantially a half revolution, a link member connected eccentrically to said element and pivotally connected to said crank arm, a power shaft rotatably supported in'said housing and extending into said tractor body, means for detachably connecting said power shaft within the tractor body to the tractor driving mechanism, and means body, an actuating rock shaft mounted in suitable bearing in said housing and extending out of the housing to operating connections with implements associated with the tractor, a crank arm fixed to said rock shaft within said housing, intermediate self-interrupting power lift mechanism disposed within said housing and having an element adapted to be optionally rotated through substantially a half revolution, a link member connected eccentrically to said element and ivotally connected to said crank arm, and means operatively connected with the tractor driving means for driving said intermediate power lift mechanism.

39. A unitary power lift attachment for tractors comprising a vertically disposed housing adapted to be secured to a wall of the tractor body, an actuating rock shaft journaled in the upper portion of said housing and extending laterally out of the housing to operating connections with implements associated with the tractor,

a power shaft journaled in the lower portion of said housing and extending into the tractor body,

means for operatively connecting said power shaft to the tractor drivingmeans, half revolution selfinterrupting power lift mechanism mounted in said housing above said power shaft and operatively connected thereto, and linkage connec-- tions within said housing between said intermediate power lift mechanism and said rock shaft for rocking the latter alternately in opposite directions between two terminal positions.

40. A unitary power lift attachment for tractors comprising a supporting casting adapted to be fixedly secured to the tractor body, an actuating rock shaft supported entirely on said casting in suitable laterally extending journal bearings carried by said casting, and extending laterally beyond the longitudinal vertical plane of at least one side of the tractor body to an operating connection withimplementmeans associated with the tractor, intermediate self-interrupting power lift actuating mechanism mounted on said casting and operatively connected to rock said rock shaft alternately in opposite directions between two terminal positions, and I means for driving saidactuating mechanism unidirectionally comprising an element rotatably mounted on said casting and a shaft extending from said element to the tractor driving means and operatively connected thereto. I

41. A unitary power lift attachment for a tractor having a casing and power transmission mechanism disposed within said casing, there being an aperture in a wall of said casing, said power lift attachment comprising a housing adapted to be secured to said casing over said aperture, a shaft joumaled in said housing. and extending through said aperture, means for connecting said shaft to said mechanism for rotating said shaft unidirectionally, said housing having a laterally extending sleeve member, an actuating rock shaft journaled in said member and extending beyond the end thereof to an operating conlift mechanism mounted within said housing and operatively connected within said housing to rock said rock shaft alternately through, a predetermined degree of angular displacement between two terminal positions, and an operating connection for driving said intermediate power lift mechanism from said unidirectionally rotated shaft, said intermediate mechanism including means for automatically interrupting the movement of said rock shaft at its terminal positions and for holding said rock shaft in a load-sustaining position when in at least one of said terminal positions.

42. In combination with a tractor having a body, power lift mechanism comprising a housing detachably secured to said body, laterally extending bearing means on said housing, a-power lift shaft supported entirely by said laterally extending bearing means and extending laterally out of one portion of said housing beyond the longitudinal vertical plane of at least one side of the tractor body to an operating connection with implement means associated with the tractor,

operating means for rotating said power lift shaft,

bearing means in another portion of said housing, a-power shaft supported in said bearing means, and means operatively connected to said power shaft for actuating said operating means'to drive said power lift shaft.

43. In a tractor, a housing, a pair of laterally spaced bearings carried by said housing, an actu ating rock shaft iournaled in said bearings and extending into said housing, intermediate power lift actuating mechanism mounted within said a housing and operatively connected within said housing to rock said rock shaft alternately in opposite directions between two terminal positions, said intermediate power lift mechanism including means for automatically interrupting the movement of said rock shaft at its terminal positions, ,a unidirectionally rotating member in the housing connected to actuate said intermediate power lift mechanism, and means for driving said unidirectionally rotating member from the tractor driving means.

44. In a tractor, a housing, an actuating rock shaft disposed within said housing and journaled in suitable laterally spaced bearings carried by said housing, said rock shaft extending out of said housing to operating connections with implements associated with said tractor, intermediate power lift actuating mechanism mounted within said housing, means disposed within said housing for operatively connecting said intermediate power lift mechanism with said rock shaft to rock said rock shaft alternately in opposite directions between two terminal positions, said intermediate power lift mechanism including means for automatically interrupting the movement of said rock shaft at its terminal positions and for holding said rock' shaft in a load sustaining position when in at least one of said terminal positions, a unidirectionally rotating member in the housing connected to actuate said intermediate power lift mechanism, and means for driving said unidirectionally rotating member from the tractor driving means.

45. In a tractor, a housing, a pair of laterally posite directions. and means on the rock shaft for actuating an implement.

46. In a tractor, a housing having oppositely and laterally extending bearing-members, a single transversely extending rock shaft supported by said members and extending through said housing and laterally to position with its opposite ends adjacent opposite sides of the tractor. means for rocking said shaft alternately in opposite directions, and implement actuating means on each 01 the opposite ends otsaid single transversely extending rock shaft.

'I'HEOPHILUS BROWN. 

